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nNrrEn srArEs rAaENr @Erica JAMEs M. BU'ICHER., oF cHIoAGo,"`ILLINoIs, AssIeNoE, BY MEsNE ASSIGNMENTS, To MARSHALL DoBBINs a Co., oF CHICAGO, ILLINOIS, A ooEroEATIoN or ILLINOIS.

PORTABLE BURGLAR-ALARM.

Specification of Letters Patent.

Patented July 22, 1919.

Application led September 12, 1914. Serial No. 861,365.

To all 'whom z'mag/ concern.'

` Be it. known that I, JAMES M. BU'roHER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Portable Burglar- Alarms, of which the following is L specication.

This invention relates to improvements in alarms, and more especially to that type of alarml which I term a portable alarm, and which may be conveniently carried by travelers for use in warning them of attempted entrance into their rooms. More particularly my invention comprises an alarm adapted to be attached` to the shank of a door knob, so that theJ turning of said tshank in either direction will cause an alarm to be given. A further feature of my invention relates to the novelty and simplicity of the structure, whereby the alarm is in expensive incost and durable and eiiicient in use. i

These and other objects of my invention will be more particularly set forth in the following specification, taken in connection with the accompanying drawings, in which I have illustrated a specific form of my invention. Y

In the drawings- Figure 1 isa front elevation of my improved alarm suspended from a door knob shank, which is shown in section.

Fig. 2 shows a rear elevation of the bell and lower portion of the standard by which it is supported.

Fig. 3 shows a side elevation of my improved alarm suspended from the shank of a door knob;

Fig. 4 shows an enlarged front elevation of the lower portion of the clamp member and of the means by which the actuating member is operated;`

Fig. 5 shows a plan view of the clamping shoe.

Referring to the drawings, the numeral 10 designates a bell which may be employed to give the alarm. This bell is of a type well known, in which there is a check member operating to normally prevent operation of the bell, and upon the release of which the bell is permitted to ring, as I term it, continuously, that is for a considerable period of time. A bell of the type shown is springactuated, and is wound up by rotating the cap portion of the bell with respect to its base or casing, but since I do not wish to be limited to any. particular form of bell, I give no detailed description thereof.

The operatingor check member of the bell is designated by the numeral 11, and is in the form of a push button, which, when pressed inwardly, causes the bell to ring, but which automatically returns to normal position to prevent the bell from ringing when the pressure thereon is` removed.

A standard or depending link 12 serves as a support for the bell, and its lower hooked extremity-shown in Fig. `Q-is provided with right angularly disposed slots 13 and 14, which are adapted to be engaged by screws 15 which enter suitable threaded apertures in the wall of the bell casing. These slots permit a variation of the position of the bell with respect to the standard and associated parts, for a purpose to be hereinafter set forth.

`The standard 12 has its upper extremity 16 angularly disposed with res ect to the longitudinal axis thereof, and t e rivet 17 engages the portion 16 for the purpose, of making a pivotal connection with the lower portion 18n of the clamp 18. `This lower portion of the clamp member is provided with an inwardly turned parallel lip 18, between which and the portion 1Sa the stan dard is supported. This clamp member is arcuate in form, as clearly shown in Fig. 1, and is provided at .its upper end with an enlarged head which is engaged by the thumb screw 19. The lower extremity of the thumb-screw forms a pivotal connection with a clamping shoe 20, which is slotted at one extremity to slide upon the body of the clamp member 18 and is provided with a substantially curved surface beneath the thumb screw. This curved surface of the shoe is adapted to engagethe shank 21 of adoor lmob 22, as clearly shown in Figs. 1 and 3, and when the thumb-screw is moved downwardly with respect to the clamp member the shank will be tightly gripped between the shoe and the portion 18a of the clamp member, which is provided with a notch 18b on its upper side for engagement with the lower side of said shank. By this means the clamp member can be rigidly connected to the shank of a door knob so as to rotate therewith.

While I have shown the clamp as constructed to engage the latch-operating shaft, it might readily be shaped to engage the knob instead.

The bell is actuated by what I term an actuating member 24, which is in vthe form of a lever co'-extensive with and pivoted on the standard 12 by means of a rivet at the point 25. The lower portion of the actuating member extends outwardly in the form `of an arc 26 adjacent the side of the bell in the form of construction here shown, and terminates'in an angularly disposed lip 27, which is arranged to engage the operating or check memberl 1l of the bell. At its upper extremity the actuating member is provided with a rounded lateral surface 28, which is adapted to coact with a cam surface 29 on the lip 18c above described. When the alarm is in its normal position it will be apparent that the weight of the bell will maintain the standard and actuating members in substantially vertical positions, and when the alarm is in this normal position the curved surface 28 of the actuating member will engage the concave portion 29a of the cam 29. When the shank 21 is rotated in either direction, however, the clamp lmember 18 will be carried around therewith and the weight of the bell-which tends at all times to maintain the standard in a vertical position-will cause said standard to swing about the pivot 17, whereupon the curved portion 28 Vof the actuating member will be caused to pass outwardly from the 'concave portion 29a of the cam surface and engage one or the other of the inwardly progecting convex portions 29b of said cam. This movement of the portion 28 of the actuating member will rotate said member about the pivot 25 and cause the lip 27 to press inwardly on the operating or check member ll, and thereby cause the bell to ring. Va-

, riations in the sensitiveness of the bell may Copies of this patent may Vbe obtained for which will be actuated to` give an alarm upon the rotation of` the door knob in either direction.

While I have shown a particular'. form `of construction anda Aparticular arrangement of the various parts "with respect to the bell, it will be understood that both the construction and arrangement of parts maybe altered in various ways without departing from the spirit of my invention as defined by theV appended ,claims I claim l. An alarm comprising a bell having an operating member,a standard by which said bell is carried,a clamp member to which `the standard is pivoted andwhichis adapted to be attached to a supporting-member, an actuating member pivoted on said standard arranged `to engage the| operating member and the clamp member, and means -to vary the relative normal relationof said actuating and operating members.

2. Analarm comprisin a bell having an operating mem-ber, astan ard `by which said bell is carried, said operating member `being movable transversely to the principal axis of said standard, `a clamp memberjto which the standard is. pivoted and which is adapted to be attached .to a supporting member, and an actuating member pivoted on said standard and arranged to be actuated by said clamp member upon relative movement of said clamp member and Vsaid standard, said `actuating' member being pro-` vided with an offset portion adapted to co` act with said operating` member to actuate the same.

3. In adevice of the class described, the combination of a `clamp adapted Ifor-attach1 ment toa latch operating shaft, Vsaid `clamp including a cam, a link pivoted to the clamp, a bell secured to the extremity ofthe link, a lever pivotedto the .link and adapted to actuate the bell, saidlever having a cam for cooperation with `the cam on the clamp whereby said lever is oscillatednin either direction with; Arespect to .thewlink when :the clamp ismovcd.

-InY testimony whereof, I have-subscribed my name.

.mainsy M. BUToH'nn;

Witnesses GLEN E. SMITH, EDYTHE M. ANDERSON.

ve cents each, by addressing the Commissioner of Patents, Washington, J). C. Y 

